Valve-operating mechanism



(No Model.) -3 Sheets -Sheet 1.

' A. LINDE'MANN. I VALVE OPERATING MECHANISM. N0. 3 5 ,457. PatentedJan. 4, 1887.

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A. LINDEMANN. VALVE OPERATING MEGEANISM.

Patented Jan, 4, 1 887.

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A. LIN-DEMANN,

VALVE OPERATING MECHANISM. No. 355,457. Patented Jan. 4, 1887.

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UNITED STATES PATENT OFFICE.

AUGUST LINDEMANN, OF ALLENTOWN, PENNSYLVANIA.

VALVE-OPERATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 355,457, dated January4, 1887. Application an June 10, isss. Serial No. 204,144. No model.)

To all whom it may concern:

Be it known that 1, AUGUST LINDEMANN, a subject of the Emperor ofGermany, residing in Allentown, Pennsylvania, have invented certainImprovements in Valve- Operating Mechanism for Stean1-Engines, of whichthe following is a specification.

Myinvention relates to that class of engines which have main and cut-offvalves, one Ohro ject of my invention being to provide simple andefficient mechanism for varying the cutoff, either automatically orotherwise, and further objects of myinvention being to lessen thefriction on the shafts which operate the valves, and,to provide readymeans of compensating for loss due to wear of the driving-shafts ortheir bearings.

In the accompanying drawings, Figure l is a sectional plan view of anengine showing my improved valve-gear. Fig. 2 is a side view with partof the valve chest cover broken away, in order to show the valves. Fig.3 is a transverse section, partly in elevation, on the line 1 2, Fig. 1.Fig. 4 is a detached perspective view of the valves and cut-off-valveoperating devices detached from the chest. Fig. 5 is a face view of themain v alve detached from the chest, and Fig. 6 a transverse section ofthe main and cut-off valves on a larger scale-than Fig. 3. v

A is the frame of the engine, 13 the cylinder, and E the crankshaft, allof whichfparts, as well as the piston, piston-rod, connectingrod,guides, 810., may be of the usual or of any desired construction,myinvention having no particular reference thereto.

The valve-chest D is at one side of the cylinder B, and is in the formof a segmentof a circle having its center at x. This point x is the axisof a rock-shaft, F, to which are connected the main valves G of theengine, the shaft cafrying a sleeve, H, by which movement is transmittedto the cut-off valves I I, which are also under the contr'ol of thegovernor, as described hereinafter.

On the crank-shaft E is a bevel-wheel, e, gearing into a bevel-pinion,e, on a shaft, J, having-its bearings in brackets j j, secured to theframe A of the engine. This shaft J has 50 a collar, a, which bearsagainst washers a, in-

terposed between the collar and the end of the upper bearing j, andonthe shaft is another collar, j, between which and the lower bearing j isa spring, j", which tends to maintain the upper end of theshaftJ incontact with a center pin, k, which is tapped into a post, It, se-

cured to the frame of the engine, as shown in Fig. 2. By this means theshaft can be adj usted longitudinally, so as to cause the collar a tohave a proper hearing at all times on the washers a, and thus compensatefor any wear of the parts, the spring j tending to sustain the weight ofthe shaft,- and thus permit the end pressure to be regulated by theset-screw.

The shaft J may have conical bearings in 6 the brackets j, if desired.

On the lower end of the shaft J is a bevelpinion,'l, gearing into abevel-wheel, Z, which is secured to a transverse shaft, L. This shaft isadapted to abearing', b, on the frame A,and 0 has a spring, 2, thetendency of which is to maintain the hubof the wheel Z in contact withthe bearing, the degree of pressure being regulated by the adjustment ofa center pin, 1 which is tapped into a bracket, Z, on the frame. (SeeFig. 1.)

On the shaft L are two eccentrics, m and n, the former for operating themain slide-valves and the eccentric n for operating the cut-oft valves.The main valve-rod M has at one end an eccentric-strap, m, adapted tothe eccentric m, and said rod is connected at its opposite end to anarm, f, on the rock-shaft F. The cut-off-valve rod N on the oppositeside of the engine has a strap, n, which is adapted 8 5 to the eccentricn, and the rod is connected to an arm,h,secured to the tubular shaft orsleeve H, which operates the cut-off'valves.

The two valves G are connected by bars (I,

so as to constitute practically one structure, 0

which is supported upon an arm, F, of the shaft F, said arm havinga'recess, 0, for the re-, ception of a transverse pin, 0, on the valvestructure, so that while said valve structure vibrates with the arm F itis free to move to- 5 ward the valve-seat as the valve or seat Wears.Each valve has an inlet-port, w, and an ex; haust-port, w, which operatein conjunction with suitable inlet and exhaust ports in the cylinder.The cut-off valves I I are flat-segmental plates'hung loosely to thesleeve H,and the vibrating movement of these valves is derived from thesleeve, an arm, T,on the latter,

having slots 9, forming guides for blocks 9 to a projecting pin, t, onwhich are hung the forked inner ends of links P, the outer ends of whichare hung to pins 19 on the valves I. It will thus be seen that the arms1? form a toggle, the center pin, 1', of which is free to move in adirection different from that of the movement of the valves; hence bythe elevation or depression of the pin 1 this toggle will be contractedor expanded and the valves I drawn together or forced apart, thismovement being wholly independent of the vibrating movement derived fromthe arm T.

The pin t may be adjusted by hand when an automatic variable cut-off isnot desired; but

- by connecting the said pin to the governor I am enabled to render thevariation of the cutoff automatic, as will be readily understood.

The governor W may be of any ordinary construction, and the connectionof the pin 71 to the governor I prefer to effect by means of the devicesshown in Figs. 3, 4, and 6, on reference to which it will be seen thateach block 9 is connected by means of a rod, Q, to a pin, t, at thelower end of a link, R, the upper end of which is hung by a pin, 8, tothe governor rod S.

The pintprojects into a slot, t, in the arm T,

so as to permit the necessary vertical move-' ment. Owing to the factthat this connecting pin it is close to the axis of the arm T, thelateral swing of the pin is but slight, and the distance of the pin tfrom the pivot-pin s of the link is such that the are in which said pinswings is almost flat, so that there is no material variation in thevertical position of the pin t due to this movement.

The shaft F and sleeve H pass through stuffing-boxes on the frame A, andin order to pro-v vide for the proper centering and support of saidshaft F and sleeve H, I hang the same upon opposite center pins, 1:,carried by brackets g on the frame A. One of the pins 1) has its bearingin the end of the shaft F; but the other pin ohas its bearing in a pin,'v,screwed into the end of the sleeve H, and forming a bearing for theinner end of the shaft.

In applying my invention to an engine having but one set of valves G l,instead of two sets, as described, one of the links P of the toggle isdispensed with.

I claim as my invention- 1. The combination of a main valve, a cut offvalve, and actuating mechanism therefor having a uniform throw, with alink connecting said valve to the operating device th erefor, and havingone end adjustable in a direction different from that of the movement ofthe valve, all substantially as specified.

2. The combination of the main valves and cutoff valves, and actuatingmechanism therefor having a uniform throw, with atoggle connecting saidcut-off valves to the operating device therefor, and having a center pinadjustable in a direction different from that of the regular throw ofthe valves, all substantially as set forth.

3. The combination of the main valves, the cut-off valves,and actuatingmechanism there for having a uniform throw, with a toggle connecting thecut-off valves to the operating device therefor, and a governor, the rodof which is connected to the center pin of the toggle, all substantiallyas specified.

4. The combination of a main valve, a cutoff-valve, and vibrating armsfor actuating the same, a link connected at one end to the cut-offvalve, a slide connected to the other end of the link and guided in thevibrating arm, a governor-rod having a pendent link, and a rod wherebythe pendent link is connected to said slide, all substantially asspecified.

5. The combination of the valves, the shaft- F and sleeve H, thecenter-pin, v, and a pin, 1), carried by the end of the .sleeve H andforming the center forthe shaft F, and a center bearing for one of thepins v, all substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses- AUGUST LINDEMANN.

Witnesses:

\VILLIAM F. DAVIS, HARRY SMITH.

